Note 712 — Chapter X
Reading edition
An excellent figure illustrating the co-existence of heterospory and secondary thickening is given by Williamson and Scott, loc. cit., Pl. LXXXII. fig. 36.
Reading edition
An excellent figure illustrating the co-existence of heterospory and secondary thickening is given by Williamson and Scott, loc. cit., Pl. LXXXII. fig. 36.